POSITION DETECTING DEVICE
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United States of America Patent
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Issued Date -
Mar 20, 2014
app pub date -
Aug 21, 2013
filing date -
Sep 20, 2012
priority date (Note) -
Abandoned
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Abstract
A position detecting device detects both a finger and a stylus radiating an electric field. The device includes: a substantially transparent sensor disposed on a display device and formed by X-electrodes and Y-electrodes; an X-selecting circuit for selecting two sets of X-electrodes as a positive terminal and a negative terminal; a Y-selecting circuit for selecting two sets of Y-electrodes as a positive terminal and a negative terminal; a driving signal generating circuit for generating signals shifted in phase from each other by 180° as a positive signal and a negative signal; a differential amplifier for amplifying a difference between signals occurring in the positive terminal and the negative terminal selected by one, or respectively each, of the X-selecting circuit and the Y-selecting circuit; and a balanced switching circuit for switching connection of the positive terminal and the negative terminal to the driving signal generating circuit or to the differential amplifier.
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